need help with multi unit config on 2 xw pros

hello everyone, i need some help here, i have the xw pro using for quite some time now, works flawlessly, recently got another as they where on clearance sale, now im trying to setup the second one so ill be able to run more loads, heater etc, i have upgraded both inverters to the latest firmware using the insight home, i have done the connection for the xanbus and sync ports using cat5 ethernet cables, ive put the inverters in standby mode and set the original (one i had working) to split phase primary, ive set the device number to 1, and xanbus port to 2, on the second inverter i put it in standby mode and set it to split phase secondary, set the device id to 2 and xanbus port to 2, when i switch both inverters to operaton mode, the secondary transformer becomes noisy (loud humming) and the screen shows 15kw to 17kw and there is no voltage output, could someone guide me as to what settings are needed so i can get the second one working, thanks